Blister of right eyelid and periocular area, sequela

This code signifies a blister on the right eyelid or the surrounding periocular area that is not caused by heat or cold exposure. It specifically indicates that this blister is a residual effect or complication of a previous injury or condition, rather than an acute event.

Use this code when documentation clearly states a non-thermal blister on the right eyelid or periocular region is a long-term consequence of an earlier injury or disease. This applies to conditions like a healed allergic reaction, a resolved infection, or a past traumatic event that has left a chronic blister as a sequela.

• Always ensure the documentation explicitly states "sequela" or indicates a chronic, residual nature of the blister.
• Verify the blister is non-thermal; if thermal, a different code from the T20-T32 series would be appropriate.
• Requires an external cause code (V00-Y99) to identify the cause of the original injury that led to the sequela, if known and applicable.